What does piranha mean?
A piranha is a tropical freshwater fish belonging to the characin family, a group that also includes related fish such as tetras and hatchetfish. Many piranhas have prominent teeth and can be opportunistic predators, feeding on fish, fruit, seeds, and other organic matter. Their reputation as man-eating fish is largely exaggerated: attacks on humans are uncommon, and many species are not exclusively carnivorous. The word is also used informally to describe a person who is intensely competitive, voracious, or aggressive. In its ordinary literal sense, piranha is a clear and useful name for a distinctive group of South American freshwater fish; in figurative use, it evokes a creature that is quick to bite, seize opportunities, or consume resources. The term is widely understood in both British and American English, although it is especially associated with descriptions of the Amazon basin and other tropical waterways.
nounA piranha is any of various tropical freshwater fish of the characin family, many of which have sharp teeth and are opportunistic predators. The term is sometimes used figuratively for an aggressive or voracious person.
- A tropical freshwater fish of the characin family, generally having a deep, laterally compressed body and sharp teeth.
- A voracious or aggressive person, used figuratively and usually in informal contexts.
"A school of piranhas moved through the shallow water near the riverbank."
"The guide warned us not to swim in the river after dark, when piranhas were most active."
"Her reputation as a piranha in the office comes from her ruthless negotiating style."
Both forms are standard; piranhas is the regular plural, while piranha is also used, especially in zoological and general reference contexts.
"Researchers observed several piranhas in the shallows."
The piranha's fearsome reputation is exaggerated: most species do not typically attack people, and many eat more plant matter than folklore suggests.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does piranha come from?
The English word piranha comes through Portuguese from a Tupi language of South America, where related forms were used for toothy freshwater fish. Portuguese speakers introduced the name into wider European usage, and English later adopted it as the established common name for this group of fish. The word is not derived from a European word and does not correspond to a closely related English family.
How piranha is actually used
The literal meaning is neutral and encyclopedic. The figurative sense is informal and conveys voraciousness, aggression, or an apparent willingness to exploit others.